Nitinol

Nitinol material is used only in Nonlinear analysis. After selecting Nitinol from the Type drop-down, the following material sections will become available: General, Structural and Nitinol.

• General and Structural

  

  • You can input Young’s modulus, shear modulus, Poisson’s ratio, thermal expansion coefficient, mass density under the General and Structural section.
• Nitinol

  

  • This material property is used for shape memory alloys.
  • It needs pressure coefficient and maximum residual strain .
  • The transformation stresses and temperature can be combined such that the transformation stress can be calculated by using the data specified for autensite to martensite and vice versa.
  • Starting stress for transformation from austensite to martensite is SSAS -CAS*TSAS.
  • Ending stress for transformation from austensite to martensite is SFAS -CAS*TFAS.
  • Starting stress for transformation from martensite to austensite is SSSA -CSA*TSSA.
  • Ending stress for transformation from martensite to austensite is SFSA -CSA*TFSA.
  • Temperatures should satisfied relation:

    TFAS<TSAS<TSSA<TFSA

  • When BTAS and BTSA are zero, the material model is linear. When BTAS and BTSA are non-zero, the material model is exponential with BTAS and BTSA as coefficients.